“Every time he gets a chance to talk about it, he sounds likes one of my kids,” Seth Meyers said.

Only a handful of Democrats and none of the party’s top leaders attended the ceremony, an outpouring of praise and mourning for the right-wing activist, who was assassinated last week.

The president and the first lady will be hosted by King Charles III and Queen Camilla at Windsor Castle. Mr. Trump will also travel to the prime minister’s country residence, Chequers.